Arrangement oe valve-motions eor locomotive-engines



UNITED STATES PATENT onirica.,`

GALEB COOK, OF NASHVILLE, NEW HAMPSHIRE.

ARRANGEMENT OF VALVE-MOTIONS rFOR LOCOMOTIVE-ENGINES. y

Speccation of Letters Patent No. 10,591, dated March '7, 1854.

In the said drawings A represents the shaft of an eccentric B, such shaft being the crank shaft of the engine, the crank of which is seen at N.

C is the valve rod, which is applied to the valve A of the steam chest of the cylinder, the seat plate and ports of which are eX- hibited at B. with a hinge D where it is hinged to a connecting rod C', such connecting rod being jointed at its other end to a curved bar or lever D, that extends upward from a bell crank rocker shaft E, that carries within its bell crank and attached to the outer part of the same, al slotted lever G, which is formed as Seen in the drawings. The lever D has a slot a formed through it, which is made curved and with a radius, whose center is at the central part of the joint between the rods C and C. The pin h upon which the rod C turns extends through the said slot and is made with a shoulder (as seen at L in Fig. 3,` which is a side view of the pin) to rest against one side of the lever D. It also has a screw and a nut adapted to it by which with the shoulder it may be confined in the slot at any elevation above the rocker shaft, whereby when said rockerV shaft is in motion a greater or less stroke or extent of movement o-f the valve over the ports will be effected. In this way I can make a cut off of the main valve. g

The slot of the lever G is formed* yof two recesses a I), which are equally distant from the aXis of the shaft E, and disposed on opposite sides of it. Thepin c, of the connecting rod I-I of the eccentric strap or ring I, rests in the lower recess a, and conse-v quently when these and the eccentric is rotated it will cause the valves of the steam chest to be put in operation.

This valve rod is formed In order to suddenly reverse the motion l of the engine we have only to lift the rod vH into the recess b. This may be eected by means of a cord or chain attached to. it and made to pass over a pulley and be pulled by an attendant or the engine man. By raising and lowering the eccentric rod, the

strap on the eccentricis moved so as to give what is termed the lap and the lead of the valve, the crank of the eccentric shaft being supposed to stand at a right angle with a line extending from the center of the, shaft to that point in the circumference of the eccentric which is at the greatest distance from the center of the shaft.`

By means of my improvement, the engine maybe instantly reversed, no matt-er what may be its speed, and without va possibility y V 'i of a failure in so doing. Such improvements enables a locomotive steam carriage to` be run with two eccentricsfor its two cylinders, whereas generally speaking four or six set of eccentrics are employed.

My improvement n-ot only simplifies but cheapens the construction of a locomotive.V

I do not claim for operating the valves an v arrangement wherein a link is employed and has attached toit the valve. rod andthe eccentric rod, the center pin of the link working in the eye of a horizontal arm attached to a rocker shaft; nor do I claimv a modification of such wherein would be the same link with the eccentric rod and valve rod attached and having the center pin of the link moving in vertical or curved guides attached to the rocker shaft as such modications do not` admit .of the reversion of the engine without the removing both the link and the eccentric rod, whereas with my improvement such can be 'effected by moving the eccentric rod only.

I therefore limit my claim to my particular arrangement orconstruction of the open lever G, as pro-vided with,V two recesses and connected to a rocker shaft and appliedV CALEB COOK.Y

Witnesses A. B. v Cook, AlLEN NELSON, 

